This is a very good example of Marsh's English countryside settings and an excellent example both of a closed-circle, claustrophobic, country house murder mystery and of a collection of unpleasant and mutually antagonistic characters.
Jonathan Royal, a batchelor with a love for theatre, hosts a tension-filled weekend party at his country house with seven guests, chosen deliberately because of their mutual animosity. The house and surrounding countryside, however, become snowbound and, during the subsequent mounting hysteria, one of the guests is murdered. Everyone present has a motive for murder but also an alibi for the time of death. Roderick Alleyn, as police investigator, soon realizes that Thomas, the dancing footman, has an important part to play in narrowing down the possibilities.
This is a great read and a 'must' for inclusion in any Ngaio Marsh collection.